Definition: You are given a question on international law. You are also given 4 answer options (associated with "A", "B", "C", "D"), out of which only one is correct. You need to answer the question by selecting the correct option. You should only answer with the choice letter, not the whole answer.
Input: Which philosopher called the idea of natural rights 'nonsense on stilts'?
(A)Alan Gerwith (B)Emmanuel Kant (C)John Locke (D)Jeremy Bentham

D